I was taught in university by soviet professors and had to study soviet textbooks and from what I can tell, Soviet textbooks are extremely steep and unfriendly. There is not a single odd word and it even feels like they had to save the paper. Text is often describing schemes that are 5-10 pages before. It takes significantly more concentration to understand the whole thing. It feels like authors used to compete in the precision of information rather than making it more available for someone who is going to read it.
On the other hand, books from USA tend to be more friendly and will first explain the basic intuition and only then dig deeper if necessary.
On the other hand, books from USA tend to be more friendly and will first explain the basic intuition and only then dig deeper if necessary.